Snmp - Siemens SIMATIC NET SCALANCE S615 Configuration Manual

The tagged frame has 3 bits for the priority that is also known as Class of Service (CoS), see
also IEEE 802.1Q.
CoS bits
000
001
010
011
100
101
110
111
The prioritization of the data packets is possible only if there is a queue in the components in
which they can buffer data packets with lower priority.
The device has multiple parallel queues in which the frames with different priorities can be
processed. As default, first, the frames with the highest priority are processed. This method
ensures that the frames with the highest priority are sent even if there is heavy data traffic.
Canonical Format Identifier (CFI)
The CFI is required for compatibility between Ethernet and the token Ring.
The values have the following meaning:
Value
0
1
VLAN ID
In the 12-bit data field, up to 4096 VLAN IDs can be formed. The following conventions apply:
VLAN ID
0
1- 4094
4095
3.4

SNMP

Introduction
With the aid of the Simple Network Management Protocol (SNMP), you monitor and control
network components from a central station, for example routers or switches. SNMP controls the
communication between the monitored devices and the monitoring station.
SCALANCE S615 Web Based Management
Configuration Manual, 11/2019, C79000-G8976-C388-08
Priority
0 (lowest)
1
2
3
4
5
6
7 (highest)
Meaning
The format of the MAC address is canonical. In the canonical representation of the MAC
address, the least significant bit is transferred first. Standard-setting for Ethernet switches.
The format of the MAC address is not canonical.
Meaning
The frame contains only priority information (priority tagged frames) and no valid
VLAN identifier.
Valid VLAN identifier, the frame is assigned to a VLAN and can also include priority
information.
Reserved
Type of the data traffic
Background
Best Effort
Excellent Effort
Critical Applications
Video, < 100 ms delay (latency and jitter)
Voice (language), < 10 ms delay (latency and jitter)
Internetwork Control
Network Control
Technical basics
3.4 SNMP
37